When To Make Your Move

     Today while working out I started to think back to when I would run track in high school. My main event was the 800 meters.  Whenever I would run that race I would let who ever was leading the race dictate how fast I was going to run it in.  I would tuck behind the leaders and on that last turn I would explode to the outside and sprint my way to a victory.  One thing I am blessed with is very few distant runners can sprint as fast as me.  I am fast enough that I could of been a sprinter but chose to go with long distance instead. Even In the mile race I would start out to set the pace and then drop back and wait for last turn.  My times would vary from the low 5 minutes to mid 4 minutes, it all had to do with how fast the leader was pushing the pace.
     As I begun to cross over into cross country and running 5K's, I soon figured out at what point in a race I could use my speed to my advantage.  In a 5K race when there is a mile left that is when I usually will make my move and try to put a gap between anyone who is close to me. One thing I also realized is no matter how tired I am when I see the finish line its like a switch goes off in me and I am able to do a all out sprint.  People have even accused me of holding back and saving energy for the finish.  I never hold back, I honestly can't explain how my body does it.  
    As I start to mainly focus on marathons I really don't worry about my 5 and 10K times as much. I use those races to practice my pace running.  But today I started to think about the marathon coming up in May and this race I am training harder than I ever have before and I honestly feel like I am in the best shape I have ever been in at this point in my training.  I also started to picture the course in my head and I was wondering at what point to I make a move.  I have no intentions of being near the lead pack but I do like to run a competitive race even if its with myself.
    My goal for the race is to break the race down into 4 sections and every section I want to speed up. I also want to throw one really good burst in.  I just am not sure at what point to do this though.  Like any other race when I see the finish line I am able to pick up the pace.   Maybe not to an all out sprint but I will be going faster than I have all day. Once again don't know how I do it. So as I was thinking about all of this and I am still left with the question: At what point do you know this is when you make your move.   I think I am going to rely on natural instinct and hopefully I will just get that feeling telling me when.

My question for you then is, at some point do you make a move and throw in a surge, and If so when and how do you know when to do it?